US4989646A - Profiled reed dent with weft passage recess - Google Patents

Profiled reed dent with weft passage recess Download PDF

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Publication number
US4989646A
US4989646A US07/389,595 US38959589A US4989646A US 4989646 A US4989646 A US 4989646A US 38959589 A US38959589 A US 38959589A US 4989646 A US4989646 A US 4989646A
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US
United States
Prior art keywords
profiled
reed
weft
dent
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/389,595
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English (en)
Inventor
Yoshio Nitta
Masayuki Muramatsu
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Toyota Industries Corp
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Nissan Motor Co Ltd
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Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Assigned to NISSAN MOTOR CO., LTD. reassignment NISSAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MURAMATSU, MASAYUKI, NITTA, YOSHIO
Application granted granted Critical
Publication of US4989646A publication Critical patent/US4989646A/en
Assigned to KABUSHIKI KAISHA TOYODA JIDOSHOKKI SEISAKUSHO reassignment KABUSHIKI KAISHA TOYODA JIDOSHOKKI SEISAKUSHO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NISSAN MOTOR CO., LTD.
Anticipated expiration legal-status Critical
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • D03D49/62—Reeds mounted on slay
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic looms

Definitions

  • the present invention relates to a weft insertion system for an air jet loom, and more specifically to a weft insertion system having sub-nozzles for ejecting auxiliary air jets toward a weft passage formed in the reed.
  • FIG. 8 shows a conventional example.
  • a reed 4 is swingable back and forth about an axis C of a sley word shaft 1.
  • the reed 4 has profiled reed cents 5.
  • Each of the profiled reed dents 5 is formed with a U-shaped recess 6 opening forwardly toward a cloth fell, and the U-shaped recesses are aligned to form a weft passage 7 extending in a weft inserting direction.
  • Sub-nozzles 9 are arranged along the weft passage 7.
  • an upper edge 5A bordering the recess 6 on the upper side is sloping so that a distance R1 of an outer end X of the upper edge from the axis C of the sley sword shaft 1 is smaller than a distance R2 of an inner end of the upper edge 5A.
  • This configuration helps a weft yarn in flying properly in the weft passage.
  • a similar weft passage is shown in a Japanese Patent Provisional Publication No. 57-143544.
  • the auxiliary air jet of each sub-nozzle bumps against the innermost edges 5B of the recesses 6, and forms an air stream carrying the weft yarn along the weft passage.
  • the weft insertion starts when the reed 4 is in a backward motion, and terminates when the reed is in a forward motion.
  • the reed 4 s moving backwards away from the cloth fell, an air stream in the weft passage tends to be left behind and to separate from the weft passage.
  • FIG. 9 shows a pressure distribution in the U-shaped recess 6.
  • Curved lines in the recess 6 are isobaric lines connecting equal air pressure points in a weft passage section which is a predetermined distance apart from one of the sub-nozzle 9.
  • a highest pressure point HP at which the pressure is highest in the recess 6 is located at a relatively shallow position whose distance 1 1 from the open end of the recess 6 is relatively short.
  • the weft yarn flies near the highest pressure point HP. Therefore, in the weft passage of this configuration, the flight course of the weft yarn is so shallow that the weft yarn tends to deviate from the weft passage.
  • the conventional configuration of the weft passage is, therefore, still unsatisfactory in that the tendency to derailment of a weft yarn is relatively high, and a large air consumption is entailed to prevent such derailment.
  • a mechanism for an air jet loom comprises a reed which is swingable back and about a swing axis, such as the axis of a sley sword shaft.
  • the reed comprises a plurality of profiled dents each of which is formed with a recess.
  • the dents are arranged so that the recesses form a weft passage.
  • Each of the recesses is defined by an upper edge, a lower edge and an inner edge which extends between the upper and lower edges.
  • each profiled dent is so shaped that a first distance from the swing axis to a predetermined outer point lying on the upper edge is smaller than a second distance from the swing axis to a predetermined inner point which lies on the upper edge and which is closer to the inner edge than the outer point.
  • the inner edge of each profiled dent is inclined so that the inner edge intersects at a predetermined angle with a straight line passing through the swing axis.
  • a line along which the inner edge extends is substantially perpendicular to a line along which the upper edge extends.
  • the center of the air stream is located at a deeper position in the weft passage. Therefore, the present invention can decrease the tendency to a swerving flight of a weft yarn, and prevent an excessive increase of the air consumption for the sub-nozzles.
  • FIG. 1 is a side view showing a mechanism according to a first embodiment of the present invention.
  • FIG. 2 is an enlarged view showing a U-shaped recess of a profiled reed dent of the first embodiment.
  • FIG. 3 is an isobaric chart showing a pressure distribution in the recess of the first embodiment.
  • FIG. 4 is an enlarged view of a recess for showing a second embodiment of the present invention.
  • FIG. 5 is an enlarged view of a recess according to a third embodiment of the invention.
  • FIG. 6 is a side view showing a mechanism of a fourth embodiment of the invention.
  • FIG. 7 is a perspective view showing an arrangement of a reed, a main nozzle and sub-nozzles, employed in each preceding embodiment of the invention.
  • FIG. 8 is a side view showing a conventional mechanism.
  • FIG. 9 is an isobaric chart showing a pressure distribution in the conventional mechanism.
  • FIGS. 1 and 2 A first embodiment of the present invention is shown in FIGS. 1 and 2.
  • a plurality of sleys 2 are fixedly mounted on a sley sword shaft 1 at predetermined intervals, and a reed holder 3 is fixed on upper ends of the sleys 2.
  • a reed 4 is firmly held by the reed holder 3. The reed 4 swings back and forth about an axis of the sley sword shaft 1.
  • the reed 4 has a plurality of profiled reed dents 5 each of which is formed with a profiled recess 6.
  • the reed dents 5 are regularly arranged, and the recesses 6 are aligned so as to form a weft passage 7 extending along a weft inserting direction.
  • the weft passage 7 is in the form of a U-shaped groove opening forwardly toward a cloth fell located ahead of the reed 4.
  • the weft passage 7 extends along the weft inserting direction from a weft inlet end located on a weft inserting side of the loom, to a weft outlet end located on a weft receiving side opposite to the weft inserting side.
  • the weft insertion system of this embodiment further includes a main air jet nozzle 8, and a plurality of sub-nozzles 9.
  • the main nozzle 8 is disposed on the weft inserting side of the weft passage 7, and aimed at the weft inlet end of the weft passage 7.
  • the sub-nozzles 9 are fixedly supported on a front side of the reed holder 3.
  • the sub-nozzles 9 are arranged at predetermined intervals along the weft passage 7, and designed to eject auxiliary air jets obliquely toward the weft passage 7.
  • the main nozzle 8 ejects a weft yarn W into the weft passage 7 from the weft inlet in, and the sub-nozzles 9 propel the forward end of the weft yarn W to the weft outlet end of the passage 7, by ejecting auxiliary jets in regular sequence.
  • Each of the profiled recesses 6 of the reed dents 5 is bounded on the upper side by an upper edge 5A, on the innermost side by an inner edge 5B, and on the lower side by a lower edge 5C.
  • the upper and lower edges 5A and 5C extend generally horizontally, and the inner edge 5B extends generally vertically from an inner end of the upper edge 5A to an inner end of the lower edge 5C.
  • the upper and lower edges 5A and 5C and the inner edge 5B form a U shape which is laid down, and opens horizontally.
  • each profiled dent 5 is shaped so as to satisfy the following relationship.
  • an outer point X is a predetermined point lying on the upper edge 5A near the open side of the recess 6.
  • a inner point Y is a predetermined point lying on the upper edge 5A near the inner edge 5B.
  • the outer point X is remoter from the inner edge 5B than the inner point Y.
  • a first distance (radius) R1 is a distance between the outer point X and the axis C of the sley sword shaft 1.
  • a second distance (radius) R2 is a distance between the inner point Y and the axis C of the sley sword shaft 1.
  • the first distance R1 is smaller than the second distance R2 (R1 ⁇ R2).
  • each profiled dent 5 of this embodiment is inclined with respect to a straight line L passing through the axis C of the sley sword shaft 1, and forms a predetermined angle "a" with the straight line L.
  • the inner edge 5B of each profiled dent 5 has an inclined portion having a narrow flat wall surface which intersects a flat plane containing the axis C of the slay sword shaft 1, at the angle "a".
  • the upper end of the inclined portion is located ahead of the flat plane, on the front side of the flat plane on which the cloth fell lies, and the lower end of the inclined portion is located on the rear side of the flat plane opposite to the front side.
  • the upper edges 5A forming an upper surface of the weft passage 7 slope down from the inner side toward the open side so that the distance from the axis C of the spring motion of the reed 4 becomes smaller toward the open side of the U-shaped of the weft passage 7. Therefore, the upper edges 5A acts so as to confine an air stream in the weft passage 7, and to prevent the air stream from escaping from the open side especially when the reed 4 is moving backwards in the first half of the weft insertion period. Thus, the upper edges 5A make it difficult for the weft yarn W to fly out of the weft passage 7.
  • FIG. 3 shows a pressure distribution obtained in the weft passage 7 of the first embodiment.
  • a highest pressure point HP at which the pressure is highest is closer to the inner edge 5B of the weft passage, and remoter from the open end of the weft passage than the highest pressure point obtained by the conventional profile of the weft passage.
  • a distance 1 2 of the highest pressure point HP from the open end of the recess 6 shown in FIG. 3 is longer than the distance 1 1 in the conventional weft passage shown in FIG. 9. Therefore, it is possible to keep the flight course of the weft yarn W deeper in the weft passage 7 from the open side without increasing the air jet pressure of the sub-nozzles 9.
  • each recess 6 is substantially perpendicular to the upper edge 5A.
  • the angle formed between the upper and inner edges 5A and 5B is an acute angle
  • the pressure decreases abruptly at the corner between the upper and inner edges 5A and 5B, so that the force pushing the weft yarn toward the wall surface is weakened abruptly.
  • Such an abrupt decrease of the pressure is prevented in the weft passage 7 of this embodiment which has no acute corner.
  • each of the upper, inner and lower edges 5A, 5B and 5C is substantially straight, but the upper corner between the upper and inner edges 5A and 5B and the lower corner between the inner and lower edges 5B and 5C are both rounded, as shown in FIG. 2.
  • a distance LH shown in FIG. 2 is a distance between the outer point X of the upper edge 5A and the flat plane in which the inner edge 5B lies.
  • the point X is a point at which the distance from the axis C of the sley sword shaft 1 is minimum. It is preferable, according to experimental results, to make the distance LH equal to 7-13 mm.
  • the upper edges 5A of the first embodiment have wall surfaces lie in a generally horizontal flat plane
  • the inner edges 5B have wall surfaces lie in a generally vertical flat plane, which is substantially perpendicular to the generally horizontal plane.
  • the lower edges 5C have wall surfaces extending in a flat plane which intersects with the vertical plane in which the inner edges 5B extend, at an angle which is equal to or greater than about 90°.
  • FIG. 4 A second embodiment of the present invention is shown in FIG. 4.
  • the weft inserting mechanism of the second embodiment is almost the same as that of the first embodiment, and different only in the following point.
  • the upper edge 5A of each profiled dent 5 is not flat, but slightly curved. Effects obtained by the weft passage of the second embodiment are substantially the same as those of the first embodiment.
  • FIG. 5 shows a third embodiment of the present invention.
  • the inner edge 5B of each dent 5 has an inclined upper portion 5D and a lower portion extending downwardly from a lower end of the upper portion 5D.
  • the upper portion 5D of the inner edge is substantially flat, and inclined so that a straight line NL showing the direction of the auxiliary jet of one of the sub-nozzles 9 is substantially perpendicular to the upper portion 5D of the inner edge 5B.
  • the auxiliary jet is ejected upwardly and obliquely toward the inclined upper portions 5D of the inner edges 5B along a straight line lying on the inclined plane passing through the line NL and extending in parallel to the weft inserting direction.
  • the lines along which the auxiliary jets are ejected by the sub-nozzles 9 lie generally on the same flat plane which intersects the flat wall surfaces of the upper portions 5D of the inner edges 5B, substantially at right angles.
  • the distance R1 is smaller than R2 as in the first embodiment, and the straight line L intersects the upper portion 5D of the inner edge 5B as shown in FIG. 5.
  • the upper portions 5D act to prevent the deviation of the weft yarn from the weft passage 7 by preventing a circulating flow from being formed in the passage 7.
  • FIG. 6 A fourth embodiment of the present invention is shown in FIG. 6.
  • the reed 4 leans forwardly toward the cloth fell, and is fixed, in the leaning posture, to the reed holder 3 so as to satisfy the conditions required in the present invention.
  • the angle between the upper and inner edges 5A and 5B is a right angle or an obtuse angle. In the fourth embodiment, it is not necessary to incline the inner edges 5B with respect to the reed 4 or the straight rear sides of the dents 5.
  • the reed 4 itself is inclined with respect to the sleys, 2 and the reed holder 3 by the shape of one or more wedge members which are forced in a groove formed in the top of the reed holder 3 together with the lower end of the reed 4, as shown in FIG. 6.
  • the reed 4 has an upper frame member holding the upper ends of the reed dents 5, and a lower frame member which holds the lower ends of the reed dents 5, and which is fixed to the reed holder 3.
  • the recess 6 is formed in the front side, and the rear side of each dent is straight.
  • the weft insertion system of the present invention can prevent deviation of weft yarn from the weft passage without increasing the air consumption, so that it is advantageous in efficiency and energy saving.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US07/389,595 1988-08-16 1989-08-04 Profiled reed dent with weft passage recess Expired - Fee Related US4989646A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63-202760 1988-08-16
JP63202760A JP2660556B2 (ja) 1988-08-16 1988-08-16 空気噴射式織機の緯入れ装置

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518041A (en) * 1993-10-27 1996-05-21 Nuovo Pignone S.P.A. Airguide channel geometry for air jet loom
US5588470A (en) * 1994-07-05 1996-12-31 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft inserting device for an air jet loom having reed pieces with recessed weft guide openings
US6019139A (en) * 1998-09-30 2000-02-01 Stell Heddle Mfg. Co. Weaving reed having reinforced dents
US6039088A (en) * 1998-09-30 2000-03-21 Steel Heddle Manufacturing Co. Reed assembly with angled dents
US6039087A (en) * 1998-09-30 2000-03-21 Steel Heddle Manufacturing Co. Reed assembly
US6079453A (en) * 1998-10-30 2000-06-27 Palmetto Loom Reed Company, Inc. Reed with reed dents having modified chin sections
US6401762B1 (en) * 1998-06-10 2002-06-11 Picanol N.V. Reed and reed dent for weaving machines
CN1318669C (zh) * 2002-03-14 2007-05-30 株式会社丰田自动织机 喷气织机用异形筘
US11521782B2 (en) 2019-09-30 2022-12-06 Hitachi Metals, Ltd. Transformer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7298537B2 (ja) * 2020-05-12 2023-06-27 株式会社豊田自動織機 エアジェット織機のサブノズル噴射方向調整装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818952A (en) * 1969-08-07 1974-06-25 G Vermeulen Jet operated weaving machine
US4328842A (en) * 1976-02-27 1982-05-11 Walter Scheffel Apparatus for weft insertion in a weaving loom
US4478259A (en) * 1981-03-05 1984-10-23 Ruti Machinery Works, Ltd. Reed for jet weaving machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818952A (en) * 1969-08-07 1974-06-25 G Vermeulen Jet operated weaving machine
US4328842A (en) * 1976-02-27 1982-05-11 Walter Scheffel Apparatus for weft insertion in a weaving loom
US4478259A (en) * 1981-03-05 1984-10-23 Ruti Machinery Works, Ltd. Reed for jet weaving machines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518041A (en) * 1993-10-27 1996-05-21 Nuovo Pignone S.P.A. Airguide channel geometry for air jet loom
US5588470A (en) * 1994-07-05 1996-12-31 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft inserting device for an air jet loom having reed pieces with recessed weft guide openings
US6401762B1 (en) * 1998-06-10 2002-06-11 Picanol N.V. Reed and reed dent for weaving machines
US6019139A (en) * 1998-09-30 2000-02-01 Stell Heddle Mfg. Co. Weaving reed having reinforced dents
US6039088A (en) * 1998-09-30 2000-03-21 Steel Heddle Manufacturing Co. Reed assembly with angled dents
US6039087A (en) * 1998-09-30 2000-03-21 Steel Heddle Manufacturing Co. Reed assembly
US6102081A (en) * 1998-09-30 2000-08-15 Steel Heddle Manufacturing Co. Weaving reed
US6079453A (en) * 1998-10-30 2000-06-27 Palmetto Loom Reed Company, Inc. Reed with reed dents having modified chin sections
CN1318669C (zh) * 2002-03-14 2007-05-30 株式会社丰田自动织机 喷气织机用异形筘
US11521782B2 (en) 2019-09-30 2022-12-06 Hitachi Metals, Ltd. Transformer

Also Published As

Publication number Publication date
KR910008970B1 (ko) 1991-10-26
JP2660556B2 (ja) 1997-10-08
KR900003456A (ko) 1990-03-26
JPH0253935A (ja) 1990-02-22

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